AQA 7181/7182 Psychology - Biopsychology - Nervous System & Endocrine System

  • Created by: CallumQ
  • Created on: 14-11-17 10:50

The Nervous System

The nervous system is the main internal communication system in the human body. It is divided into two main components; the central nervous system and the peripheral nervous system.

The Central Nervous System

The central nervous system is comprised of the brain and the spinal cord.

The brain's function is to provide conscious awareness. It is involved in all psychology processes. The outer layer of the brain, the cerebral cortex, which distinguishes our mental functions from animals.

The spinal cord is responsible for reflex actions such as reeling your hand away when you touch a hot plate, for instance.

The CNS is responsible for relaying messages to and from the brain and connecting nerves to the peripheral nervous system.

The Peripheral Nervous System

It is the role of the PNS to transmit messages and from the CNS via millions of neurons. The PNS is composed of two subsystems; the autonomic nervous system and the somatic nervous system.

The Autonomic Nervous System

This system is reponsible for transmiting information to and from internal bodily organs. It gets its name because it operates involuntarily: it is autonomic. This subsystem can be broken down even further into the sympathetic nervous system and the parasympathetic nervous system. The system governs vital functions such as in the body such as breathing, heart rate, sexual arousal and stress responses.

Sympathetic Nervous System

This system is typically involved in the systems which prepare the body for fight or flight. This occurs by the SNS sending impulses to organs in the body when we are faced with a dangerous situation. Examples of these functions typically involve the heartrate increasing, bloodpressure and breathing increasing with less critical functions such as…


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